CVE catalog
CVE-2026-49284
SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated l
- Severity
- High · CVSS 7.1
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.22% · Oct 25, 2026
SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | simplesamlphp | sid | 2.5.3.1-1 | fixed |
| Debian | simplesamlphp | forky | 2.5.3.1-1 | fixed |
| Debian | simplesamlphp | bookworm | 1.19.7-1+deb12u2 | vulnerable |
| Debian | simplesamlphp | bookworm-security | 1.19.7-1+deb12u1 | vulnerable |
| Cpe | simplesamlphp | Not reported | Not reported | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | simplesamlphp | source | sid | 2.4.8-1 | not yet assigned | Not reported | Not reported |
| Debian | simplesamlphp | source | forky | 2.4.8-1 | not yet assigned | Not reported | Not reported |
| Debian | simplesamlphp | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
Notes
[bookworm] simplesamlphp: Reachability-gated: multi-IdP mixed-trust deployments only; SP warns-and-continues on issuer mismatch and accepts unsigned Response InResponseTo; fix along with the next DLA
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [simplesamlphp]Affected
Details (4)
1.19.7-1+deb12u2· all · bookwormAffected
nvd · simplesamlphp · debian · bookworm; nvd · simplesamlphp · debian · 12
1.19.7-1+deb12u2· all · bookwormAffected
nvd · simplesamlphp · debian · bookworm; nvd · simplesamlphp · debian · 12
1.19.7-1+deb12u1· all · bookworm-securityAffected
nvd · simplesamlphp · debian · bookworm; nvd · simplesamlphp · debian · 12
1.19.7-1+deb12u1· all · bookworm-securityAffected
nvd · simplesamlphp · debian · bookworm; nvd · simplesamlphp · debian · 12
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-49284]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-49284]
- [https://security-tracker.debian.org/tracker/CVE-2026-49284]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3403.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]